It is shown that it is possible to use a standard rapid-scan Fourier transform infrared FT-IR spectrometer for dynamic infrared measurements. Spectrum acquisition time is significantly reduced in comparison with two-dimensional infrared (2D IR) spectrometers employing the step-scan technique. In the case of polymers, for which stress relaxation often occurs over time, the reduction of the total measurement time proves to be an essential feature. Experimental and mathematical details are discussed. Application of the rapid-scan technique is illustrated with some results for a styreneacrylonitrile/butadiene copolymer.

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